The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2011
Filed:
Nov. 21, 2008
Hideaki Ito, Kiryu, JP;
Kenji Sugaya, Kiryu, JP;
Kazufumi Yamashita, Kiryu, JP;
Toshio Maehara, Kiryu, JP;
Shoji Oiwa, Kiryu, JP;
Hideaki Ito, Kiryu, JP;
Kenji Sugaya, Kiryu, JP;
Kazufumi Yamashita, Kiryu, JP;
Toshio Maehara, Kiryu, JP;
Shoji Oiwa, Kiryu, JP;
Nidec Servo Corporation, Gumma, JP;
Abstract
A motor driving circuit for full-wave single-phase driving a motor includes a position detection unit, a turn-on signal generation unit, and switching devices that define an H-bridge circuit. The turn-on signal generation unit includes a differential amplifier arranged to produce a trapezoid wave signal, and a square wave generation circuit arranged to produce a square wave signal, wherein the trapezoid and the square wave signals are respectively supplied to control terminals of lower switching devices in the H-bridge circuit. Further, one of the lower switching devices is turned on and off according to a voltage level of the square wave signal, and the remaining lower switching device is turned on and off when a voltage of the trapezoid wave signal becomes higher than an operation voltage of the remaining lower switching device, wherein a non-conducting interval is provided for the motor coil according to the operation voltage.